A:Answer The lenses in Frames Tempo can be easily and quickly swapped out to suit your surroundings. Our Twilight Yellow replacement lenses are great for low-light environments. They're ideal for evening or early morning training, helps brighten trails and enhance visibility in dark, cloudy, or foggy environments. They're 77% VLT, which helps in these situations. The included lenses are shatter and scratch resistant, polarized, and rated 12% VLT, 99% UVA/B.
